Re: REALLY OT: News Flash
Chris Bannister wrote:
Or the 12 billiard balls where one is lighter/heavier and all you have
is a set of balance scales.
You have to find which one it is plus whether its lighter or heavier in
3 weighings.
I think/hope its 3 :-)
I see how to do it in 4. In fact, I found two ways. I haven't
found a way in 3 (yet).
How about, you have N bags of coins. Each bag has some number
of coins in it, each one has at least N coins. You know that
one of the bags has counterfeit coins in it, and you know that
the counterfeit coins each weigh one gram less than real coins.
You have a scale. How, in one weighing, can you find which
bag has the counterfeit coins?
Mike
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